Mark Webber said the final part of qualifying for the Belgian Grand Prix was "bizarre" with the DRS being switched off mid-way through the session.

Paul di Resta had been the first driver to set a time on intermediate tyres in Q3 but with the rain intensifying the DRS was disabled by race control, making it difficult for the later runners to beat the time. Webber, Sebastian Vettel and Lewis Hamilton eventually improved having managed an extra lap at the end of the session but Webber said the DRS issue added to the unpredictability during qualifying.

"It was difficult I think for all of us to make all the right calls, but in the end I think we got most things right," Webber said. "It's very easy to look stupid from a team's side or a driver's side making the right calls and in the end we got most things pretty good I'd say.

"It's a little bit bizarre with the DRS on and off in the session, actually in Q3 it's available in the first part of qualy and not available in the end but it's the same for everyone. It's a very difficult thing to know where you are, how the track is moving around so much and actually it was quite a ballsy thing for me to go slow in the middle lap knowing if the track's going to be better on the last lap to save the tyres, because the inters are struggling a little bit in those conditions.

"In the end it wasn't too bad a lap and it was quite tight obviously so I'm pretty happy to be right up there for tomorrow's race."

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